Some dogs ARE NOT born with them, and most good breeders will remove them at 2 days old because there are
no nerve endings there yet so they simply pluck them out. My hospital removes them all the time from large
breed dogs (especially the bully breeds). You wouldn't believe how many dogs would come in having pulled out
their own dewclaws on things and almost bleeding to death, or having pulled them out part ways and it is quite
painful. So many people decide to have them removed during neutering/spaying.
We have yet to have any problems the 5 years I was there. We use a laser method, which removes the nail from
the nailbed. This is a much less painful method compared to the old cut and pull. Not only does the laser heal
faster with much less bloodloss, but in the cut and pull method I have seen the dewclaws grow back (it looks like
a cat's claw.. very thin, sharp, and weird). We generally wrap the foot around the ankle, put a cone on their heads,
and prescribe pain meds. They usually heal in a week or two, the younger the pup the faster it heals.